Eeonogrjlph-reprodttcer



T. H. REED. PHONOGRAPH'REPRODUCER. APPLICATION FILED JULY 19.1918.

1 2 1,476. Patented Nov. 11, 1919.

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Titans 3. nnni), or NEWARK, NEW JERSEY.

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Application filed'Iuly 19, 1918. Serial No. 245,746.

To" all whom it may concern:

Be it known that I, THOMAS.H. REED, a

citizen of the United States, residing in the city of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in .Phonograph- Reproducers, of' which the following is a. full, clear, and exact description, such as willenable others skilled in the art t9 which it pertains to make, construct, and use the same, reference being had to the accompanying drawings, and to characters of refer- .ence marked. thereon, forming a part of this i ner, thestylus lever being attached'to the diaphragm andhaving one end pivotally and yieldingly mounted upon the sound box casing, and means for adjusting the tension of the diaphragm; and it'further comprises means for regulating the tension of the diaphragm and for balancing the reproducing lever with casing. 4 V

Referring to the accompanying drawings, in which l have illustrated one. preferable embodiment of my invention, I will proceed to describe the same, havingit-understood that 1 am not limited to the specific details shown and described, as it is manifest that these may be modified without departing from the spirit or scope of the invention.

Figure 1 represents a front view of my improved reproducer: constructed in accord ance with my present invention. a

Fig. 2 represents a side elevation of the same, and r Fig. 3 represents on an enlarged scale, a fragmentary longitudinal, vertical, sectional View. i

rliuiilar characters of reference refer to like parts throughout the specification and drawings. 4 I

Referring to the drawings 1 represents a cylindrical. casing tanned inwardly at its Specification of Letters Patent.

respect to the diaphragm and passes Patented Nov. 11, 1919.

forward edge, to form a flange 2, and screw threaded at its rearward edge portion for the reception of a back plate 3 which is m.

vided with a central opening 4, and has integrally formed thereon, the usual boss 5 for attaching it to the sound conveying means which lead to the horn. The back plate 3 is screw-threaded and has screw-threaded engagement with therear of the casing 1 for supportmg the plate in the casing, and for moving the plate within the casing to regulate the tension of the diaphragm, said screw threaded back plate being further providedwith apertures or key-ways -6 for the purpose of adjusting the same. Positioned within the said casing 1, between and hearing against the flange 2 thereof, and the in? ner face of the washer 7, are two annular gaskets 8 and 9 preferably made of rubber,

and in cross section either solid, circular and hollow, between which supported a diaphragm 10. The diaphragm 10 is preferably made of laminated skins, or it may be made of any other suitable material employed for thisrpurpose. Upon placing the diaphragm in position between the gaskets,

the back'plate 3 is screwed into the casinm forcing the washer 7 toward the flange of the casing until the proper tension of the diaphragm is obtained. The tension of the diaphragm may be adjusted to any degree v desired y corresponding movement'of the back plate 3.

Bearing centrally upon the outer face of the diaphragm 10 is the inner end of the stylus lever 11, which is provided with a boss 12. On the rear side of the diaphragm is arranged a Washer 13, preferably made of metal.

through the boss to clamp the parts together, and to clamp the diaphragm between the boss and the washer. The stylus leyer 11 is provided with an apertured ex- 100' tension for the reception of the ordinary stylus (not shown), which is designed to be held in place by a set screw 15. The casing 11. is provided with two laterally opposed apertured ears or lugs 16 and 17, so ar- 1 05 ranged as to provide an open space therebetween, to receive a knurled adjusting nut 18, and a screw-threaded post 19, one end of said post 19 being rigidly secured to the free end of the'stylus lever- 11, as clearly indi- 11o cated in the drawings. portion of the screw-threaded post 19, adyacent to the un- The screw 14, which has screw threaded engagement with the washer 13,

derside of the stylus lever 11, is reduced in cross section for a portion of its length, as

indicated at 20, to make the post sufliciently flexible, .to' serve not only to hold the lever upon its bearing, but also as'a spring to exert an influence lever.

The free end of the screwrthreaded post beyond the apertured ear or lug 17 1S engaged by a lock nut 21, which bears upon the underside of thefapertured ear or lug 17 to lock the threaded post 19 upon the oscillation of the and stylus lever in their adjusted positions.

In the operation of theinvention, after the parts are assembled as shown in Figs. 2 and 3 of the d-rawings,the nut 21 serves to lock the parts in theiradjusted osition.

.Inorder to prov-idea su 'cient amount of .tension upon the'screw-threaded post 19 for effecting a proper regulation of the stylus lever-to produce the best results it only becomes necessary to release the locking nut turning the knurledadjusting nut'18 ineitherdirection, will cause the stylus lever to be drawn toward or away from the casing '1, and .a proper tension of the diaphragm can be effected; B turning the lock nut 21 back upon the un erside of the apertured ear or lug 17 the parts are I adjusted position,

positively locked in their against accidental displacement. The back plate 3, therefore not only serves" to tension the diaphragm but it also serves to place the stylus lever under greater or less tension namely;

a clearer tone as corresponding to the tension of the diaphragmi a My improved construction enables me to dispense with a number of parts, thereby reducing the actual number of parts, toobtainthe following results, to a minimum,

a very sensitive so-called micrometer adjustment of the stylus lever and dia phragm, a more perfect reproduction, and well as a freer movement .of thestylus lever.

Experience. has demonstratedthat the organization above described is a highlyeflicient one, and while I have shownthe preferred embodiment of my present invention 1 do not wish'to be limited-to the exact details of construction shown and described,

center of the free from the 038111" mounted upon and may be such departures from what is herein set forth, I consider within the scope and terms of my claims. I

Having thus described my invention, what I desire to secure by Letters Patent, is

1. A reproducer comprisinga hollow casing provided with opposed apertured lugs, a diaphragm,

diaphragm, a. screw-threaded post rigidly secured to the stylus lever, said post extending from the underside of the stylus lever, and at right angles thereto, and through said apertured lugs, an adjusting nut located between said apertured lugs and mounted upon and having screw-threaded engagement with said screw-threaded post for effecting a stylus lever.

2. Areproducer ing provided with a diaphragm, a stylus lever secured to the center of the diaphragm, a screw-threaded post rigidly secured to the stylus-lever, said post extending from the underside of the said stylus lever, and at right angles thereto, and through said apertured lugs, said screwthreaded post adjacent to the underside of the stylus lever being reduced in cross section for a portion of its length, an adjusting nut located between said apertured lugs and mounted upon and having screw-threaded engagen'ient with said screw -threaded post for effecting a proper regulationof said stylu. lever.

3. reproducer comprising a hollow casing provided. with opposed apertured lugs, a diaphragm, a stylus lever secured to the center of the diaphragm, a screw-thrrutded post provided with a flexible comprising a hollow casand extending through saidapertured lugs designed to solely support the stylus lever B, located between said apertured'lugs and having screw j threaded said screw-threaded post proper regulation of said engagement with for effecting a stylus lever. I

This specification signed and witnessed this'21st day of June, 1918,

THOMAS-H, REED. Witnesses:

FREDK C. FISCHER, ANNA EGAN;

proper regulation of said and an adjusting nut.

a stylus lever secured to the opposed apertured lugs,

portion rigidly seowed to the outer free end of the stylus lever 

